If this happens, you will have to start again to build up the following that you worked so hard for.
There are so many posting and scheduling apps around now that it's ridiculous - schedugram, Later (formerly Latergramme). Hootesuite, Buffergram...the list goes on.
The problem with these apps is two-fold.
1) They only schedule your posts so you still have to go in and post the content yourself, this means that you're paying a subscription and still have to go into the app and manually post anyway.
2) They post directly putting ALL of your content at risk. I don't know about you but I've worked really hard to build up my following so I wouldn't even consider it.
For social media managers, or people who are looking after a few accounts posting content every day can become time consuming and counter productive so try this workaround hack that I use.
Prepare your content each week or month for your individual accounts and email yourself with the post, comment and a list of hashtags. Each day/at the appropriate time bring up Instagram on your phone and copy and paste the post and your comments.
It might not sound like rocket science but it has saved me hours each week finding and posting content.
Because my emails are on my phone too, I can post on the go as and when the client requests.
This way you can prepare your content in one go as you can do with other social media, there's no risk to your existing content AND you don't have to pay a ridiculous subscription fee!
If I'm behind the eight-ball with this, I wish someone would have told me sooner!!