Backup: Not enough memory on the memory card.

Is this fat32 issue?

You should move manually all photos/videos on the sd card (and make an extetnal backup also), the Sailfish backup will then be super fast and way smaller.

Probably same reason as here: https://together.jolla.com/question/216239/backup-should-handle-no-space-left-on-device/ ?

Device storage full?

I have just experienced the same problem, and I believe it is caused by the maximum filesize on FAT volumes. I reformatted my SDcard to use the ext4 filesystem without journalling, and after rebooting, reran the backup to get a file size of the backup tar of 4335974400 bytes, which is larger than the filesize limit on vfat of 4294967295 bytes. The average phone user will not be able to do this, and in any case probably would not want to, as ext4 is not ideal for portability across operating systems.

I suggest that Jolla could usefully modify the backup script to pipe the output of tar to the 'split' program

tar <whatever> | split --bytes=4294967295 - backup.tar.gz. (the trailing dot is signficant) This will produce files backup.tar.gz.aa backup.tar.gz.ab backup.tar.gz.ac</whatever>

and so on.

A restoration script simply can use cat to feed the files back into tar

cat backup.tar.gx.* | tar <blah blah=""></blah>

(There are probably better ways, this stack exchange item gives some ideas and links: https://unix.stackexchange.com/questions/61774/create-a-tar-archive-split-into-blocks-of-a-maximum-size )

Just to add to my above comment - the problem would also be 'solved' if sdcards could use F2FS, However, I believe Jolla would be best served by modifying the backup software to split overlarge backups into files that can be stored on FAT volumes so that the user-experience for non-technical users is made as good as possible. Like it or not, fat file systems are the common denominator for exchanging data on removeable rewriteable physical devices. Unless and until some of the more popular operating systems support F2FS (or even UDF) well, Jolla need to make sure that users can remove the SD card and it is readable on other systems: which means using vFAT, and splitting over-large backups.