Trust me - this will save you a ton of heartache! Every personal profile can create TWO business managers, EACH with 5 ad accounts to start. You can ONLY do this while your current business manager is in good standing. Once you outgrow the 5 ad account limit simply message business manager support for an ad account limit increase! I call this work around - the alternate! If anything happens you have another entire account to fall back on. I highly recommend you protect yourself by having a backup. Pro note: to also backup the actual campaign metadata (campaign structure, etc.) of your ad account use the free tool go.aarchival.com.