They are necessary files but they should be getting removed once a backup completes. Usually it will only uses the larger amount of space the first time it backs up the data. Subsequent backups will only send new files and incremental changes. If they are being left behind it indicates the backups are are failing currently or had failed prior and it was unable to clean up.
The reason it needs this space is to encrypt and compress your data. It needs the swap space to create the content. The more you are trying to encrypt and compress the more temporary space it needs. The space is usually given back once the process is finished.
The easiest way to minimize how much it needs at the first backup is to select the data to backup in sections instead of everything at once. The easiest way to accomplish this is add the first category you wish to backup, let it run and then add another once the last backup finishes. This way its recording what you had selected, grabbing changes and adding your new content in smaller batches.
In the event it does leave the files behind you can temporarily disable Norton Tamper Control by doing the following:
1. Open N360 2. Go to Settings 3. Uncheck ‘Norton Tamper Protection’ on the right hand side. 4. Select 15 minutes from the popup.
You can then use My Computer or Windows Explorer and remove all the ARC files. You can also safely remove any @DB, @SB or .DIF files. I’d advise leaving SLG and LOG files behind. The backup process will re-create the files it needs the next time you run it. Note you are technically removing system files so it is unadvisable to remove any other files.
If you see that your backups are failing, with any other message besides the out of space, send me a PM and we can look into the root cause.