I would consider it not safe because it was on of the companies mentioned on the NSA slides.
You can still sync your Keepass(x) file with Dropbox if you have a good password (key file is recommended) on the database file.
Instead of Dropbox you can also use https://spideroak.com/
They have a really handy program which let you control a lot of things and they are a "zero knowledge" cloud provider, all your data is encrypted.
Snowden recommends them: http://www.theguardian.com/technology/2014/jul/17/edward-sno...
For $12 dollar a month you get 1 TB, which you can use as a safe off-site backup location.
Instead of Dropbox you can also use https://spideroak.com/ They have a really handy program which let you control a lot of things and they are a "zero knowledge" cloud provider, all your data is encrypted. Snowden recommends them: http://www.theguardian.com/technology/2014/jul/17/edward-sno... For $12 dollar a month you get 1 TB, which you can use as a safe off-site backup location.