Script to schedule automated batch-downloading of all SHSH blobs from Apple that it's currently signing for all iOS devices you own. You are expected to have ran TinyUmbrella at east once. Requires https://github.com/Neal/savethemblobs.

local.shared.savethemblobs.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Label</key>
	<string>local.shared.savethemblobs</string>
	<key>LowPriorityIO</key>
	<true/>
	<key>Nice</key>
	<integer>19</integer>
	<key>ProgramArguments</key>
	<array>
		<string>bash</string>
		<string>-c</string>
		<string>~/.shsh/savethemblobs.sh</string>
	</array>
	<key>StartCalendarInterval</key>
	<dict>
		<key>Hour</key>
		<integer>12</integer>
		<key>Weekday</key>
		<integer>3</integer>
	</dict>
</dict>
</plist>

savethemblobs.sh

#!/bin/bash

set -e
renice 19 -p $$

if ! $(python -c "import sys, os, argparse, requests, json, six" &> /dev/null); then
    echo "ERROR: Required Python modules are missing" >&2
    exit 1
fi

: ${SHSH_DIR:="${HOME}/.shsh/"}

SAVEIFS=$IFS
IFS=$(echo -en "\n\b")
for FILE in "${SHSH_DIR}.known_devices/"*.plist
do
    ECID="$(grep -A1 UniqueChipID "$FILE" \
            | tail -1 \
            | sed 's/^.*\<integer\>//;s/\<\/integer\>.*$//;')"
    PRODUCTTYPE="$(grep -A1 ProductType "$FILE" \
                   | tail -1 \
                   | sed 's/^.*\<string\>//;s/\<\/string\>.*$//;')"
    DEVICENAME="$(grep -A1 DeviceName "$FILE" \
                  | tail -1 \
                  | sed 's/^.*\<string\>//;s/\<\/string\>.*$//;')"
    echo "※ Downloading SHSH blobs for $DEVICENAME"
    python ${SHSH_DIR}savethemblobs.py \
           --save-dir "$SHSH_DIR" \
           $ECID $PRODUCTTYPE
done
IFS=$SAVEIFS

1. Make sure you have write permissions on the path set to $SHSH_DIR.
2. Copy the file local.shared.savethemblobs.plist into your Home folder's ~/Library/LaunchAgents/.
3. Open the file with a text editor, such as TextEdit and change the value of the following line

<string>~/.shsh/savethemblobs.sh</string>

so that it points to the path where savethemblobs.sh resides. Note that savethemblobs.sh also expects savethemblobs.py from https://github.com/Neal/savethemblobs to exist in the same folder you are saving SHSH blobs in.
4. Open Terminal and type:

launchctl load ~/Library/LaunchAgents/local.shared.savethemblobs.plist

The script will run every wednesday at 12h noon. Edit the appropriate segment of local.shared.savethemblobs.plist to change that schedule.