ERROR: Dropbox API: (404) File could not be found at the specified path or rev.

If ther any other errors or warinings bevore that?

Hi Daniel,
It has changed now (I didn’t change any settings), no errors, just warnings now.

[27-Apr-2014 22:01:00] Database backup done!
[27-Apr-2014 22:01:00] 1. Trying to make a list of folders to back up …
[27-Apr-2014 22:12:38] WARNING: Job restarts due to inactivity for more than 5 minutes.
[27-Apr-2014 22:12:38] 2. Trying to make a list of folders to back up …
[27-Apr-2014 22:12:42] 987 folders to backup.
[27-Apr-2014 22:12:42] 1. Trying to create a WordPress export to XML file …
[27-Apr-2014 22:12:45] Check WP Export file …
[27-Apr-2014 22:12:45] WP Export file is a valid WXR file.
[27-Apr-2014 22:12:45] Added XML export "Marta-Walenda-hand-painted-jewellery-and-home-decor.wordpress.2014-04-27.xml" with 1.60 MB to backup file list.
[27-Apr-2014 22:12:45] 1. Trying to generate a file with installed plugin names …
[27-Apr-2014 22:12:45] Added plugin list file "Marta-Walenda-hand-painted-jewellery-and-home-decor.pluginlist.2014-04-27.txt" with 2.80 kB to backup file list.
[27-Apr-2014 22:12:45] 1. Trying to generate a manifest file …
[27-Apr-2014 22:12:45] Added manifest.json file with 6.63 kB to backup file list.
[27-Apr-2014 22:12:45] 1. Trying to create backup archive …
[27-Apr-2014 22:12:45] Compressing files as TarGz. Please be patient, this may take a moment.
[27-Apr-2014 22:23:12] WARNING: Job restarts due to inactivity for more than 5 minutes.
[27-Apr-2014 22:23:13] 2. Trying to create backup archive …
[27-Apr-2014 22:29:07] WARNING: Job restarts due to inactivity for more than 5 minutes.
[27-Apr-2014 22:29:07] 3. Trying to create backup archive …
[27-Apr-2014 22:37:10] WARNING: Job restarts due to inactivity for more than 5 minutes.
[27-Apr-2014 22:37:10] 1. Try to send backup file to Dropbox …
[27-Apr-2014 22:37:11] Authenticated with Dropbox of user H (H)
[27-Apr-2014 22:37:11] Uploading to Dropbox …
[27-Apr-2014 22:37:12] 1. Trying to check database …
[27-Apr-2014 22:37:12] Result of table check for mw3p9q0f_bwg_album is: OK
[27-Apr-2014 22:37:12] Result of table check for mw3p9q0f_bwg_album_gallery is: OK
[27-Apr-2014 22:37:12] Result of table check for mw3p9q0f_bwg_gallery is: OK
[27-Apr-2014 22:37:12] Result of table check for mw3p9q0f_bwg_image is: OK
[27-Apr-2014 22:37:12] Result of table check for mw3p9q0f_bwg_image_comment is: OK
[27-Apr-2014 22:37:12] Result of table check for mw3p9q0f_bwg_image_tag is: OK
[27-Apr-2014 22:37:12] Result of table check for mw3p9q0f_bwg_option is: OK
[27-Apr-2014 22:37:12] Result of table check for mw3p9q0f_bwg_theme is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_commentmeta is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_comments is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_itsec_lockouts is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_itsec_log is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_itsec_temp is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_links is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_options is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_postmeta is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_posts is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_snippets is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_term_relationships is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_term_taxonomy is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_terms is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_usermeta is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_users is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_woocommerce_attribute_taxonomies is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_woocommerce_downloadable_product_permissions is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_woocommerce_order_itemmeta is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_woocommerce_order_items is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_woocommerce_tax_rate_locations is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_woocommerce_tax_rates is: OK
[27-Apr-2014 22:37:13] Result of table check for mw3p9q0f_woocommerce_termmeta is: OK
[27-Apr-2014 22:37:13] Database check done!
[27-Apr-2014 22:37:13] WARNING: Job finished with warnings in 2176 seconds. Please resolve them for correct execution.

Please try to set the maximum executin time in BackWPup > Settings > Tab: Jobs. Begin with an value of 30 secounds.

When I changed to 30 seconds this heppened:

[29-Apr-2014 21:17:12] Compressing files as TarGz. Please be patient, this may take a moment.
[29-Apr-2014 21:23:05] WARNING: Job restarts due to inactivity for more than 5 minutes.
[29-Apr-2014 21:23:05] 2. Trying to create backup archive …
[29-Apr-2014 21:29:16] WARNING: Job restarts due to inactivity for more than 5 minutes.
[29-Apr-2014 21:29:16] 3. Trying to create backup archive …
[29-Apr-2014 21:35:39] WARNING: Job restarts due to inactivity for more than 5 minutes.
[29-Apr-2014 21:35:39] 1. Try to send backup file to Dropbox …
[29-Apr-2014 21:35:40] Authenticated with Dropbox of user H (H)
[29-Apr-2014 21:35:41] Uploading to Dropbox …
[29-Apr-2014 21:35:42] One old log deleted
[29-Apr-2014 21:35:42] WARNING: Job finished with warnings in 1115 seconds. Please resolve them for correct execution.

and then I changed to 180 seconds with this result:

[29-Apr-2014 21:57:36] Compressing files as TarGz. Please be patient, this may take a moment.
[29-Apr-2014 22:03:42] WARNING: Job restarts due to inactivity for more than 5 minutes.
[29-Apr-2014 22:03:42] 2. Trying to create backup archive …
[29-Apr-2014 22:12:02] WARNING: Job restarts due to inactivity for more than 5 minutes.
[29-Apr-2014 22:12:03] 3. Trying to create backup archive …
[29-Apr-2014 22:12:49] Backup archive created.
[29-Apr-2014 22:12:49] Archive size is 320.57 MB.
[29-Apr-2014 22:12:49] 13779 Files with 585.00 MB in Archive.
[29-Apr-2014 22:12:49] 1. Try to send backup file to Dropbox …
[29-Apr-2014 22:12:50] Authenticated with Dropbox of user H (H)
[29-Apr-2014 22:12:50] Uploading to Dropbox …
[29-Apr-2014 22:13:00] WARNING: fseek() expects parameter 2 to be long, string given
[29-Apr-2014 22:18:09] WARNING: Job restarts due to inactivity for more than 5 minutes.
[29-Apr-2014 22:18:09] 2. Try to send backup file to Dropbox …
[29-Apr-2014 22:18:10] Authenticated with Dropbox of user H (H)
[29-Apr-2014 22:18:10] Uploading to Dropbox …
[29-Apr-2014 22:18:21] ERROR: Dropbox API: (404) File could not be found at the specified path or rev.
[29-Apr-2014 22:18:21] 3. Try to send backup file to Dropbox …
[29-Apr-2014 22:18:22] Authenticated with Dropbox of user H (H)
[29-Apr-2014 22:18:22] Uploading to Dropbox …
[29-Apr-2014 22:18:38] ERROR: Dropbox API: (404) File could not be found at the specified path or rev.
[29-Apr-2014 22:18:38] ERROR: Step aborted: too many attempts!
[29-Apr-2014 22:18:38] 2 old logs deleted
[29-Apr-2014 22:18:38] ERROR: Job has ended with errors in 1267 seconds. You must resolve the errors for correct execution.

How long is the maximum PHP Execution time set?