Error when trying to backup database

[Sunflowersc2]

Note: This post only applies to the Legacy database!

I have been trying to backup my database but keep getting an error and the database will not backup at all. Here is what I get every time.
Starting backup of table License
Error during backup of database C:\Users\Vicky\Approved Workman\Data - DBISAM Engine Error # 9218 Error writing to the table or backup file 'G:\AW Backup v5415 5-11-2016.bkp'
Processing Ended: 5/11/2016 2:04:34 PM  Elapsed time: 0.2 minutes

Nothing has changed with the exception of the latest update.
What can I do to fix this?
Thank you.

[Annette]

This error is usually related to lack of available disk space.  Check the flash drive to be sure there is enough space for the backup file.  If you have a lot of AWdb backups on it, delete the old ones and just keep a couple of the most recent ones.

Let us know if that solves the problem.

[Sunflowersc2]

I deleted many of the previous backups on my external drive but still received the same error message. There are probably too many other files that I cannot delete at this time. I had a flash drive and decided to give that a try and the database backed up normally. Thank you for the advise and quick response!