We have done new heavy tests of the website backup script on a small capacity web hosting, with low memory limit, short execution time, a lot of files and a database with big tables. Everything was perfect with the full and the incremental files backup but we have detected errors during the database backup.
Several bugs during the database backup are now fixed. Those bugs did not stop the backup process or corrupt data during our tests. But they could interrupt the process, and they mainly locked the detection of error during backup and did not allow the auto adjustment of the number of lines for the chunk. Now the database backup interruption due to the maximum execution time limit has a better management, the chunk is automatically adjusted, and finally the whole process is more smooth.
To avoid error during data encryption. Now a minimal memory of 16Mo is required to run the script. We have try to change parameters to run with a 8Mo memory. But the encryption of data is something that can be very capricious with PHP especially with large files, and it seems to be impossible to have something working well with less than 16Mo.
Even if everything seem alright during your backups process you have to update your script to 2.2. Download it now from your customer area. We hope now to have found and corrected all the bugs available in the v2, and to see the v3 as the next version, with new functionalities.