Adobe has patched its Creative Cloud apps after people noticed the software was deleting Mac users' files without warning.
After customers updated Creative Cloud, it accessed their hard drive and deleted the first folder that appeared in alphabetical order.
Due to file-naming conventions on Mac computers, the bug often deleted hidden system folders or data backup files.
Adobe issued a fix for the issue on Sunday.
Many people in the creative industries have reacted angrily on social media.
"So CreativeCloud is what screwed up my Backblaze backups. Thanks, Adobe," said college instructor JJ Litke.
"I think Adobe owes us an explanation, and owes Backblaze a public apology. This bug is disturbing and terrifying," tweeted Funjon.
"Great news that fix is out but very disappointed Adobe haven't been very transparent or apologetic about the issue," said another user.
The problem came to light on Thursday after Backblaze, which makes data backup software, started receiving hundreds of support requests from its customers.