question : can i use backup for cold storage ?

[Meuh6879]

Hello,

For now, i use the good backup function of bitcoin android wallet ... and email this to many location.
I love this system, it's simple and secure.
I can manipulate many "light" wallet to organize and store my Bitcoin.

My point is ... this system is good (for this App) after 1-2 years ?
Or does i plan to transfer regulary my backup to other bitcoin adress with the regulary updated App ?

The dark point is : the backup system is the same than the first developpement of Android Bitcoin wallet ? Or it has evolved since v1 for exemple ? (we are in v3.46).

[Andreas Schildbach]

The backup format has not changed since 2011. But indeed, it will change in near future. However, you will still be able to import old backups.

Even if the app vanishes in a puff of smoke, you can decrypt your backup using openssl and import the private keys into bitcoin core by hand (its using "sipa" format). See the README about the openssl command line.

[Meuh6879]

  always perfect answer, very thanks