Support

Are you absolutely sure you want to do this?

Backing up to a single file when you have a site whose backup is nearly 10GiB big has a lot of unintended consequences:

• You will not be able to store the backup remotely. Most remote storage services have an upper limit on the file sizes. For example, Amazon S3 has a limit of 5GiB. Your archive will be bigger than this, therefore it cannot be stored remotely.
• It will only work if BOTH the server you are backing up from AND the server you are restoring to use a 64-bit version of PHP. This is NOT a given on Windows. Most prepackaged servers still use 32-bit versions of PHP which are limited to files with a maximum size of 2,147,483,647 bytes (2GiB minus one byte).
• Older filesystems cannot store these files. Remember that older filesystems like FAT32 and exFAT have a hard limit on the maximum file size around 4GiB. This means that even if you have a fairly big USB-connected flash drive (let's say a 32GiB one) you will NOT be able to store your backup in it unless you format it to NTFS (Windows), APFS/HFS+ (macOS), or any Linux-supported filesystem (e.g. ext4).

As you can see, these are all limits external to Akeeba Backup. We cannot do anything about them… except implement a backup archive format which allows splitting the backup archive in multiple files, with each file below the limit you are likely to hit. That's why the default value for the Part Size For Split Archives is 2000 MiB. It is slightly smaller than the lowest of these limits, giving a “safety margin” (when extracting a backup archive the internal file position may go beyond the End of File, hence the need for a safety margin which avoids the position marker from overflowing to negative values).

If you really want to change this despite the problems it will cause, yes, of course we let you do that. Click the Configure button in the Archiver Engine and set the Part Size For Split Archives to 0. But, please, do remember that you have been warned not to do that.

As I said, find the Archiver Engine row.

Click on the Configure... button next to it.

Now you can see the option: